jan 1, 1904 - Joseph John Thomson
Description:
J.J Thomson discovered electrons and protons. Thomson's discovery of electrons happened when he was studying an electric current going through a gas. After performing experiments Thomson was led to believe that electrons have a small mass and a negative charge. Thomson was also experimenting with gas discharge when he noticed there were much heavier particles with a positive charge. These were later called protons.
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Evolution of the Atom
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